Bulk DNS Lookup Tool
Look up A records for up to 50 domains at once with our free bulk DNS lookup tool. Enter one domain per line, click to start the bulk query, and get results in a sortable table showing IP addresses, response times, TTL values, DNSSEC validation status, and any errors. Export the results as CSV for reporting. All queries use Cloudflare's DNS-over-HTTPS for encrypted, private lookups - no signup required.
Enter one domain per line. Protocol and paths are stripped automatically. Max 50 domains.
Why Use Our Bulk DNS Lookup Tool?
Bulk DNS Lookup for Up to 50 Domains
Query A records for up to 50 domains at once - enter domains one per line and get instant results. Our bulk DNS lookup tool processes each domain sequentially using Cloudflare's DNS-over-HTTPS API, showing live progress as each domain is resolved. No need to look up domains one by one.
Misconfiguration Detection & DNSSEC
The bulk DNS lookup tool automatically detects missing A records, NXDOMAIN responses, and query errors for each domain. DNSSEC validation status is displayed for every result, showing whether the DNS response has been cryptographically authenticated by the resolver.
CSV Export for Reporting
Export all bulk DNS lookup results as a CSV file with one click. The CSV includes domain names, A record IP addresses, query times, TTL values, DNSSEC status, and error notes - perfect for documentation, audits, sharing with your team, or importing into spreadsheets.
Free & No Limits
Perform bulk DNS lookups on unlimited sets of domains with no signup, no API key, and no usage limits. The bulk DNS lookup tool is completely free forever using Cloudflare's public DNS-over-HTTPS resolver - no account required.
Common Use Cases for Bulk DNS Lookup
Domain Portfolio Management
Manage DNS configurations across a portfolio of domains by running bulk lookups to verify that A records point to the correct IP addresses. Domain investors and registrars use the bulk DNS lookup tool to quickly audit DNS settings across dozens of domains at once.
DNS Migration Verification
After migrating DNS hosting providers, use the bulk DNS lookup tool to verify that A records have propagated correctly across all your domains. Check that each domain resolves to the expected IP address and identify any domains that still point to the old provider.
Email Infrastructure Auditing
Audit email DNS configuration across multiple domains by checking A records for mail subdomains and verifying that MX hosts resolve correctly. The bulk DNS lookup tool helps identify misconfigured mail server records that could affect email deliverability.
Security & Threat Investigation
Security researchers use the bulk DNS lookup tool to investigate domain infrastructure at scale. Map IP addresses to domains, identify shared hosting patterns, and detect suspicious domains that resolve to known malicious IP addresses.
Website Monitoring & Reporting
Generate regular DNS health reports for client websites by running bulk lookups and exporting results as CSV. Agencies and freelancers use the bulk DNS lookup tool to document DNS configurations for client handovers and compliance audits.
CDN & Cloud Service Configuration
Verify that multiple domains are correctly configured to point to CDN endpoints or cloud load balancers. The bulk DNS lookup tool makes it easy to check that all subdomains resolve to the correct CDN IP addresses after a platform migration.
Understanding Bulk DNS Lookup
What is a Bulk DNS Lookup?
A bulk DNS lookup is the process of querying DNS records for multiple domains simultaneously or in rapid succession. Instead of looking up each domain individually through a single-domain tool, our bulk DNS lookup tool lets you enter up to 50 domains at once and retrieves their A records (IPv4 address mappings) using Cloudflare's DNS-over-HTTPS (DoH) API. Each domain is queried sequentially to ensure accurate response times and avoid rate limiting, with live progress updates as the scan progresses.
How Our Bulk DNS Lookup Tool Works
- Enter domains: Type or paste up to 50 domain names into the text area, one per line. The tool automatically strips protocols and paths, so you can paste full URLs and they will be cleaned. Invalid domain names are counted and flagged so you know which entries need correction.
- Bulk query execution:Click "Look Up All Domains" and the tool queries each domain's A records sequentially via Cloudflare's DNS-over-HTTPS endpoint. A progress indicator shows which domain is currently being resolved. Each query includes the DNSSEC OK flag to request cryptographically validated responses.
- Review and export results: Results are displayed in a sortable table showing domain, status (OK, Missing, Error, Invalid), A record IP address(es), query time in milliseconds, TTL, DNSSEC validation status, and any error notes. Export the full results as a CSV file for reporting and analysis.
Understanding DNS A Records & Status Codes
- A Record: Maps a domain name to an IPv4 address. This is the most fundamental DNS record type - every website needs an A record (or a CNAME pointing to a host that has one) to be accessible on the internet.
- NOERROR (Status 0): The query succeeded. If A records are present, the domain is resolving correctly. If no A records are returned despite a NOERROR status, the domain exists but has no A records configured - it may use only IPv6 (AAAA) or may be a CNAME-only domain.
- NXDOMAIN (Status 3): The domain does not exist in the DNS. This typically indicates a typo, an expired domain, or a domain that has not been registered yet.
- DNSSEC Validated: When displayed, the DNS response has been cryptographically signed and verified. This confirms the A record data has not been tampered with during transit.
Privacy & Performance
All DNS queries in the bulk DNS lookup tool are sent directly from your browser to Cloudflare's DNS-over-HTTPS endpoint over an encrypted HTTPS connection. We do not store, log, or process your DNS queries on our servers.Cloudflare's privacy policy governs how they handle DoH queries - they commit to not selling query data and deleting logs within 25 hours. Sequential querying with a small delay between requests prevents rate limiting and ensures reliable results for all domains.
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Frequently Asked Questions About Bulk DNS Lookup
A bulk DNS lookup tool queries DNS records for multiple domains at once, saving you from looking up each domain individually. Our bulk DNS lookup tool queries A records for up to 50 domains via Cloudflare's DNS-over-HTTPS API, displaying results in a sortable table with IP addresses, response times, TTL values, DNSSEC status, and error detection.
You can look up DNS records for up to 50 domains in a single batch. Enter one domain per line in the text area. The tool will query each domain sequentially with a small delay between requests to avoid rate limiting. If you enter more than 50 domains, the tool will show a warning and the lookup button will be disabled.
The bulk DNS lookup tool currently queries A records (IPv4 address mappings) for each domain. This is the most fundamental DNS record type and is essential for verifying that a domain is reachable. The results table shows the resolved IP addresses, query time, TTL, and DNSSEC validation status for each domain.
No. All DNS queries are sent directly from your browser to Cloudflare's DNS-over-HTTPS endpoint. We do not store, log, or process your DNS queries on our servers. Cloudflare's privacy policy governs how they handle DoH queries - they commit to not selling query data and deleting logs within 25 hours.
"Missing" means the domain exists (NOERROR response) but has no A records configured. "Error" means the DNS query failed due to a network issue, timeout, or the domain does not exist (NXDOMAIN). "Invalid" means the domain name could not be parsed - check for typos or unsupported characters.
Yes. Click the "Export CSV" button to download the full results as a comma-separated values file. The CSV includes domain names, status, A record IP addresses, query times, TTL values, DNSSEC status, and error notes. This is useful for documentation, audits, and importing into spreadsheets.
DNSSEC validated means the DNS response has been cryptographically authenticated by the resolver, confirming that the A record data has not been tampered with during transit. A green checkmark in the DNSSEC column indicates the domain has DNSSEC enabled and the response was verified. A dash means DNSSEC is not enabled or not validated.
Yes! The bulk DNS lookup tool is 100% free with no signup, no API key, and no usage limits. Look up DNS records for as many domains as you need, as often as you need - completely free, forever. The tool uses Cloudflare's public DNS-over-HTTPS resolver, which is also free.